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United Nations Environment Programme ,  [Workbook for Training in Adopting, Applying and Operating Environmentally Sound Technologies (ESTS) – Regional Workshop] ,  Workbook for Training in Adopting, Applying and Operating Environmentally Sound Technologies (ESTS) – Regional Workshop

United Nations Environment Programme ,  Institute of Water Management of the Ministry of Environmental Protection and Water Management of the German Democratic Republic ,  [Eutrosym ‘76: Proceedings the International Symposium on Eutrophication and Rehabilitation of Surface Water - Vol. II] ,  Eutrosym ‘76: Proceedings the International Symposium on Eutrophication and Rehabilitation of Surface Water - Vol. II

United Nations Environment Programme ,  International Lake Environment Committee Foundation (ILEC) ,  [International Shiga Forum on Technology for Water Management in the 21st Century - Proceedings] ,  International Shiga Forum on Technology for Water Management in the 21st Century - Proceedings